The Influence of Natural Gas Composition on Ignition in a Direct Injection Gas Engine Using Hot Surface Assisted Compression Ignition

Æsøy, Vilmar; Valland, Harald

doi:10.4271/961934

Cited by 23 publications

(21 citation statements)

References 3 publications

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“…As mentioned in the previous section, the variations in the concentrations of heavier hydrocarbons in natural gas have a direct impact on the reactivity of natural gas and its tendency to autoignite in internal combustion engines. This observation was also supported by Aesoy and Valland [39]. They observed that the autoignition delay was reduced by a factor of 2-3 for natural gas when compared to pure methane.…”

Section: Ignition Characteristics Of Methane and Higher Alkanessupporting

confidence: 71%

“…Aesoy and Val land [39] observed that 8% propane addition to pure methane reduced its autoignition temperature by approximately 120 K, which increases the knocking tendency.…”

Section: The Influence Of Natural Gas Composition On Combustionmentioning

confidence: 99%

“…In this application, natural gas is injected directly into the cylinder near the end of compression stroke close to a hot surface. This hot surface is generally a glow plug with a temperature range of 1200-1400 K [39]. The most important advantages of this system are high specific power and thermal efficiency without the limitation of knock.…”

Section: Compression Ignition Natural Gas Enginesmentioning

confidence: 99%

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Autoignition modeling of natural gas for engine modeling programs: an experimental and modeling study

Soylu¹

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Section: Ignition Characteristics Of Methane and Higher Alkanessupporting

confidence: 71%

“…Aesoy and Val land [39] observed that 8% propane addition to pure methane reduced its autoignition temperature by approximately 120 K, which increases the knocking tendency.…”

Section: The Influence Of Natural Gas Composition On Combustionmentioning

confidence: 99%

Section: Compression Ignition Natural Gas Enginesmentioning

confidence: 99%

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Autoignition modeling of natural gas for engine modeling programs: an experimental and modeling study

Soylu¹

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“…The results predicted by both chemical models are consistent with the experimental data for the initial combustion chamber temperatures changing from 1400 to 1600 K. However, the two-step methane model improves the predicted ignition delay and matches better with the experimental data at the low temperature side (from 1200 to 1300 K). Previous studies conducted by several groups 6,7 have indicated that a minimum surface temperature of 1200 K was required for the GP to achieve a reliable natural gas ignition, and hence, the GP surface temperature was usually set in the range of 1200–1500 K for the simulations.…”

Section: Methodsmentioning

confidence: 99%

Numerical studies of the ignition characteristics of a high-pressure gas jet in compression-ignition engines with glow plug ignition assist: Part 1—Operating condition study

Pan

Wallace

2017

International Journal of Engine Research

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This article presents the results of computational studies investigating the ignition of high-pressure natural gas jets in a compression-ignition engine with glow plug ignition assist. The simulation was conducted using a KIVA-3V-based three-dimensional engine model, along with an improved fuel injector model, a detailed cut-off glow plug shield model and a modified two-step methane reaction mechanism, to simulate the natural gas injection and ignition. The simulated results demonstrate the significance of using a shield for the glow plug. Compared to an unshielded (bare) glow plug, the shield not only reduces the heat loss from the hot glow plug surface to the cold intake air charge and the cold injected gas jet but also traps the fuel mixture to increase its residence time adjacent to the hot surface. Over a representative range of heavy-duty diesel engine operating conditions, a shielded glow plug greatly improves the natural gas engine performance and provides reliable ignition, while an unshielded glow plug can only be optimized for specific conditions. The understanding of glow plug shield behavior gained from the simulations suggests avenues for improved shield designs that would yield further reduced ignition delays.

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“…GPs have also been applied to natural gas cogeneration engines 20,21 and partially premixed CI engines fueled by a blend of diesel and gasoline 22 and have shown the benefits of improving the engine efficiency and reducing emissions. 20–22 In CI engines, GP ignition has been investigated experimentally by a number of researchers to assist ignition of difficult-to-ignite alternative fuels, including methanol, 23–27 propane, 28 natural gas, 29–32 and heavy liquid fuels. 33 A common finding is the requirement for a minimum surface temperature.…”

Section: Introductionmentioning

confidence: 99%

Numerical studies of the ignition characteristics of a high-pressure gas jet in compression ignition engines with glow plug ignition assist: Part 2-Effects of multi-opening glow plug shields

Pan

Wallace

2017

International Journal of Engine Research

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The results of a previous study, part 1, showed that use of a shield can improve the thermal performance of a glow plug, and thereby reduce ignition time. However, the part 1 study also found that use of a simple shield with only one circular opening can delay flame propagation out of the shield. The conclusions of that study suggested that there is scope for further improvements of the shield design, especially the shield opening geometry. Accordingly, this article presents the results of computational studies investigating the influence of multi-opening shield designs on natural gas ignition characteristics in glow plug–assisted compression–ignition engines. Two types of multi-opening glow plug shield, consisting of four small circular openings distributed in either diamond-pattern or square-pattern arrangements, were employed. The simulated results demonstrated that both multi-opening shields can not only increase glow plug surface temperature, but also increase the residence time of fuel mixture adjacent to the glow plug surface in the early injection stage, resulting in a faster ignition than the single-opening shield. Furthermore, the diamond-pattern multi-opening glow plug shield provides a faster or comparable flame propagation path back to combustion chamber, compared to single-opening glow plug shield, while the square-pattern multi-opening glow plug shield delays the flame propagation under several specific engine conditions. Compared to the single-opening glow plug shield, the overall natural gas ignition delays are further reduced by 6%–44% when using the diamond-pattern multi-opening glow plug shield, while the square-pattern multi-opening glow plug shield is only able to reduce the natural gas ignition delay under a few specific conditions.

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The Influence of Natural Gas Composition on Ignition in a Direct Injection Gas Engine Using Hot Surface Assisted Compression Ignition

Cited by 23 publications

References 3 publications

Autoignition modeling of natural gas for engine modeling programs: an experimental and modeling study

Autoignition modeling of natural gas for engine modeling programs: an experimental and modeling study

Numerical studies of the ignition characteristics of a high-pressure gas jet in compression-ignition engines with glow plug ignition assist: Part 1—Operating condition study

Numerical studies of the ignition characteristics of a high-pressure gas jet in compression ignition engines with glow plug ignition assist: Part 2-Effects of multi-opening glow plug shields

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